From: Milan Broz <[email protected]>
When an ioctl is performed on a multipath device
simply pass it on to the underlying block device
through current_path. If current path is not yet selected,
select it.
Signed-off-by: Milan Broz <[email protected]>
Signed-off-by: Alasdair G Kergon <[email protected]>
Index: linux-2.6.17/drivers/md/dm-mpath.c
===================================================================
--- linux-2.6.17.orig/drivers/md/dm-mpath.c 2006-06-21 17:45:15.000000000 +0100
+++ linux-2.6.17/drivers/md/dm-mpath.c 2006-06-21 18:32:08.000000000 +0100
@@ -1266,12 +1266,39 @@ error:
return -EINVAL;
}
+static int multipath_ioctl(struct dm_target *ti, struct inode *inode,
+ struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct multipath *m = (struct multipath *) ti->private;
+ struct block_device *bdev = NULL;
+ unsigned long flags;
+ int r = 0;
+
+ spin_lock_irqsave(&m->lock, flags);
+
+ if (!m->current_pgpath)
+ __choose_pgpath(m);
+
+ if (m->current_pgpath)
+ bdev = m->current_pgpath->path.dev->bdev;
+
+ if (m->queue_io)
+ r = -EAGAIN;
+ else if (!bdev)
+ r = -EIO;
+
+ spin_unlock_irqrestore(&m->lock, flags);
+
+ return r ? : blkdev_ioctl(bdev->bd_inode, filp, cmd, arg);
+}
+
/*-----------------------------------------------------------------
* Module setup
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 0, 4},
+ .version = {1, 0, 5},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
@@ -1281,6 +1308,7 @@ static struct target_type multipath_targ
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,
+ .ioctl = multipath_ioctl,
};
static int __init dm_multipath_init(void)
-
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